CN108601123A - A kind of variable frequency induction heater circuit - Google Patents
A kind of variable frequency induction heater circuit Download PDFInfo
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- CN108601123A CN108601123A CN201711118654.4A CN201711118654A CN108601123A CN 108601123 A CN108601123 A CN 108601123A CN 201711118654 A CN201711118654 A CN 201711118654A CN 108601123 A CN108601123 A CN 108601123A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
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Abstract
The present invention relates to a kind of variable frequency induction heater circuits, including heater circuit, display and microcontroller power supply circuit, microcontroller power supply circuit is connected with display and heater circuit respectively, heater circuit is connected with display, heater circuit includes sequentially connected single chip control module, photoelectric coupling circuit, half-bridge driven amplifying circuit, IJBT full-bridge modules and full-bridge control circuit, and photoelectric coupling circuit is also connected with IJBT full-bridge modules and full-bridge control circuit respectively.The control to sensing heating frequency is realized by exporting the control of empty accounting to microcontroller; the requirement to sensing heating workpiece depth is realized by the variation of induction frequencies; the control to induction heating temperature is realized by the control of empty accounting; the protection to the service life of field-effect transistor is realized by the control of microcontroller automatic frequency aligning rate, reduces the loss of element.
Description
Technical field
The present invention relates to variable frequency induction technical field of heating, and in particular to a kind of variable frequency induction heater circuit.
Background technology
Current sensing heating forward position and most potential technology the most in heating systems, are the weights of advanced manufacturing technology
Want developing direction.With the demand of development in science and technology and popularization and application, induction heating technique becomes more and more important.Sensing heating
Exactly workpiece is put into inductor, inductor is usually to input intermediate frequency or high-frequency ac (300-300000Hz or higher)
Hollow copper tubing.Generate the induced current that alternating magnetic field produces same frequency in workpiece, distribution of this induced current in workpiece
Be it is non-uniform, it is strong on surface, and internal very weak, to center portion close to 0, using this kelvin effect, workpiece surface can be made
Rapid heating, surface temperature rises to 800-1000 DEG C in seconds, and center portion temperature increases very little.Currently on the market
Sensing heating frequency needs selection, and frequency, the depth of the higher heating of frequency are selected according to heat treatment and the requirement of heat penetration
Degree is more shallow.Three kinds are generally divided into, high frequency intermediate frequency power frequencies.The depth of high frequency (10KHZ or more) heating is 0.5-2.5mm, generally
For the heating of middle-size and small-size part, such as fine module gear and medium and small axial workpiece.Intermediate frequency (1 ￣ 10KHZ) heat penetration is 2-
10mm is generally used for the gear heating of the big axis class of diameter and big-and-middle modulus.It is 10- that power frequency (50HZ), which heats depth of hardening zone,
20mm is generally used for the diathermanous of large-size part, the surface hardening of major diameter part (diameter 300mm or more, such as roll).
In the prior art there is frequency conversion in sensing heating, need to be changed hardware, so that the frequency of sensing heating
Rate cannot be adjusted freely.
Invention content
Technical problem to be solved by the invention is to provide a kind of inductive heating circuits that each frequency range can be achieved.
The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of variable frequency induction heater circuit, including heating electricity
Road, display and microcontroller power supply circuit, the microcontroller power supply circuit are connected with display and heater circuit respectively, described to add
Heater circuit is connected with display, and the heater circuit includes sequentially connected single chip control module, photoelectric coupling circuit, half-bridge
Drive amplification circuit, IJBT full-bridge modules and full-bridge control circuit, the photoelectric coupling circuit also respectively with IJBT full-bridge modules
It is connected with full-bridge control circuit.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the single chip control module include microcontroller U1, clock circuit, I2C communication interfaces, low frequency input by
Button and reset circuit, the microcontroller U1 are connected with display by I2C communication interfaces, the model of the microcontroller U1
ATMEGA328P；The clock circuit includes capacitance C1, capacitance C2 and crystal oscillator X1, one end of the capacitance C1 and the one of crystal oscillator X1
End is all connected with the 7th pin of microcontroller U1, and one end of the capacitance C2 and the other end of crystal oscillator X1 are all connected with the 8th of microcontroller U1
Pin, the other end of the capacitance C1 and the other end of capacitance C2 are all connected to ground；The I2C communication interfaces include SDA interfaces
With SCL interfaces, the SDA interfaces are connected with the 26th foot of microcontroller U1, and the SCL interfaces are connected with the 27th foot of microcontroller；
The low frequency load button includes the 23rd pipe of one end and microcontroller U1 of button K1, button K2 and button K3, the button K1
Foot is connected, and one end of the button K2 is connected with the 24th pin of microcontroller U1, and one end of the button K3 is with microcontroller U1's
25th pin is connected, and the other end of the other end of the button K1, the other end of button K2 and button K3 is all connected to ground；It is described
Reset circuit includes reset button K0 and reset resistor R0, and one end of the reset button KO and one end of reset resistor R0 connect
It is connected to the 29th pin of microcontroller U1, the other end of the reset button K0 is connected to ground, the other end of the reset resistor R0
It is connected respectively with the+5V output voltages of the 18th pin of microcontroller U1 and microcontroller power supply circuit.
Further, the photoelectric coupling circuit includes optocoupler U2, optocoupler U3, optocoupler U4, optocoupler U5 and optocoupler U6, the light
Coupling U2, optocoupler U3, optocoupler U4, optocoupler U5 and optocoupler U6 model be PC817, the 2nd pin of the optocoupler U2, optocoupler U3
2nd pin, the 2nd pin of optocoupler U4, the 2nd pin of optocoupler U5, optocoupler U6 the 2nd pin be all connected to ground, the optocoupler U2
The 1st pin be connected with the 10th pin of microcontroller U1 by resistance R1, the 3rd pin of the optocoupler U2 and full-bridge control circuit
It is connected, the 4th pin of the optocoupler U2 is connected with the signal output end of power circuit, and the 1st pin of the optocoupler U3 passes through electricity
Resistance R2 is connected with the 32nd pin of microcontroller U1, and the 3rd pin of the optocoupler U3 is connected with half-bridge driven amplifying circuit, the light
The 4th pin of coupling U3 is connected with half-bridge driven amplifying circuit, IJBT full-bridge modules and VCC respectively by resistance R6, the optocoupler
The 1st pin of U4 is connected by resistance R3 with the 1st pin of microcontroller U1, and the 4th pin of the optocoupler U4 is put with half-bridge driven
Big circuit is connected, and the 3rd pin of the optocoupler U4 is connected with half-bridge driven amplifying circuit by resistance R7 and is connected to ground, described
The 1st pin of optocoupler U5 is connected by resistance R4 with the 2nd pin of microcontroller U1, and the 3rd pin and the half-bridge of the optocoupler U5 drive
Dynamic amplifying circuit is connected, the 4th pin of the optocoupler U5 by resistance R8 respectively with half-bridge driven amplifying circuit, IJBT full-bridge moulds
Block is connected with VCC, and the 1st pin of the optocoupler U6 is connected by resistance R5 with the 9th pin of microcontroller U1, the optocoupler U6's
3rd pin is connected with half-bridge driven amplifying circuit by resistance R9 and is connected to ground, and the 4th pin and the half-bridge of the optocoupler U6 drive
Dynamic amplifying circuit is connected.
Further, the half-bridge driven amplifying circuit includes half-bridge driver U7 and half-bridge driver U8, and the half-bridge drives
The model of dynamic device U7 and half-bridge driver U8 is IR2106, the 1st pin of the half-bridge driver U7 respectively with resistance R6,
VCC is connected with the anode of diode D1, and the 2nd pin of the half-bridge driver U7 is connected with the 4th pin of optocoupler U4, and described half
The 3rd pin of bridge driver U7 is connected with the 3rd pin of optocoupler U3, the 4th pin connection resistance R7 of the half-bridge driver U7
And it is connected to ground, the 5th pin of the half-bridge driver U7 is connected by resistance R11 with IJBT full-bridge modules, and the half-bridge drives
The 6th pin of dynamic device U7 is connected with one end of IJBT full-bridge modules and capacitance C3 respectively, the 7th pin of the half-bridge driver U7
Be connected with IJBT full-bridge modules by resistance R10, the 8th pin of the half-bridge driver U7 respectively with the other end of capacitance C3 and
The cathode of diode D1 is connected, the 1st pin of the half-bridge driver U8 anode with resistance R8, VCC and diode D2 respectively
It is connected, the 2nd pin of the half-bridge driver U8 is connected with the 4th pin of optocoupler U6, the 3rd pin of the half-bridge driver U8
It is connected with the 3rd pin of optocoupler U5, the 4th pin connection resistance R9 of the half-bridge driver U8 is simultaneously connected to ground, the half-bridge
The 5th pin of driver U8 is connected by resistance R13 with IJBT full-bridge modules, the 6th pin difference of the half-bridge driver U8
It is connected with one end of capacitance C4 and IJBT full-bridge modules, the 7th pin of the half-bridge driver U8 is complete by resistance R12 and IJBT
Bridge module is connected, and the 8th pin of the half-bridge driver U8 is connected with the cathode of the other end of capacitance C4 and diode D2 respectively.
Further, the IJBT full-bridge modules include field-effect transistor Q1, field-effect transistor Q2, field-effect transistor
Q3, field-effect transistor Q4, capacitance C7 and induction coil L1, the grid of the field-effect transistor Q1 are connected with capacitance R10, institute
State the source electrode of field-effect transistor Q1 respectively with the 6th pin of half-bridge driver U7, one end of capacitance C7 and field-effect transistor
The drain electrode of Q2 is connected, the drain electrode of the field-effect transistor Q1 respectively with the drain electrode of field-effect transistor Q3 and full-bridge control circuit
It is connected, the grid of the field-effect transistor Q2 is connected by R11 with the 5th pin of half-bridge driver U7, and the field-effect is brilliant
The source electrode of body pipe Q2 is connected with the source electrode of field-effect transistor Q4 and full-bridge control circuit respectively, the field-effect transistor Q3
Grid be connected with the 7th pin of half-bridge driver U8 by resistance R12, the source electrode of the field-effect transistor Q3 respectively with sense
6th pin of one end, half-bridge driver U8 for answering coil L1 is connected with the drain electrode of field-effect transistor Q4, the induction coil L1
The other end be connected with the other end of capacitance C7, the grid of the field-effect transistor Q4 passes through resistance R13 and half-bridge driver
The 5th pin of U8 is connected.
Further, full-bridge control circuit include diode D3, relay RL1, full bridge rectifier BR1, fuse FU1 and
Coil one end of knife-like switch SW1, the relay RL1 are connected with the 3rd pin of the cathode of diode D3 and optocoupler U2 respectively, institute
The coil other end for stating relay RL1 is connected with the anode of diode D3 and is connected to ground, contact one end of the relay RL1
It is connected with 1 end of full bridge rectifier BR1, the contact other end of the relay RL1 passes through fuse FU1 and knife-like switch SW1
Be connected with 220V power supplys, 2 ends of the full bridge rectifier BR1 respectively with the drain electrode of field-effect transistor Q1 and field effect transistor
The drain electrode of pipe Q3 is connected, and 3 ends of the full bridge rectifier BR1 are connected by knife-like switch SW1 with 220V power supplys, and the full-bridge is whole
4 ends of current circuit BR1 are connected with the source electrode of the source electrode of field-effect transistor Q2 and field-effect transistor Q4 respectively.
Further, 2 ends of full bridge rectifier BR1 are also connected with one end of capacitance C8 and VCC respectively, the full-bridge rectification
The other end of 4 ends of circuit BR1 also with capacitance C8 is commonly connected to ground.
Further, microcontroller power supply circuit includes that voltage-stablizer U9, capacitance C5, capacitance C6, capacitance C7, capacitance C8, full-bridge are whole
The primary coil and 220V of the model 78L05, the transformer T1 of current circuit BR2 and transformer T1, the voltage-stablizer U9 are defeated
Enter voltage to be connected, the secondary coil of the transformer T1 is connected with 1 end of full bridge rectifier BR2 and 3 ends respectively, the full-bridge
2 ends of rectification circuit BR2 are connected with 3 ends of one end of capacitance C8, one end of capacitance C7 and voltage-stablizer U9 respectively, and the full-bridge is whole
4 ends of current circuit BR2 and the other end of capacitance C8, the other end of capacitance C7,2 ends of voltage-stablizer U9, one end of capacitance C6 and electricity
The one end for holding C5 is all connected to ground, and the other end of the capacitance C6 and the other end of capacitance C5 are connected to the 1 end production of voltage-stablizer U9
Raw+5V output voltages.
The beneficial effects of the invention are as follows：Change output frequency and the duty ratio of PWM by microcontroller to realize bridge-drive
The change of device reverse frequency drives 4 field-effect transistors by two half-bridge drivers, is exchange by DC inverter,
It is then added to resonant capacitance and the concatenated RLC series resonant circuits of induction coil, the electromagnetism of certain frequency is generated on induction coil
, induced current is generated in heated object, so that workpiece is heated because of electricresistance effect, induction coil sensing heating is made to be operated in not
Same frequency is realized to the control of sensing heating frequency by exporting the control of empty accounting to microcontroller, passes through induction frequencies
Variation realize the requirement to sensing heating workpiece depth, the control to induction heating temperature is realized by the control of empty accounting
System realizes the protection to the service life of field-effect transistor by the control of microcontroller automatic frequency aligning rate, reduces the loss of element,
The temperature of sensing heating can also be controlled by the adjusting to the empty accounting of output, it is made to accomplish a tractor serves several purposes and energy-efficient mesh
's.
Description of the drawings
Fig. 1 is structure of the invention schematic diagram.
Specific implementation mode
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in Figure 1, a kind of variable frequency induction heater circuit, including heater circuit, display and microcontroller power supply circuit, it is single
Piece electromechanics source circuit is connected with display and heater circuit respectively, and heater circuit is connected with display, and heater circuit includes successively
Single chip control module, photoelectric coupling circuit, half-bridge driven amplifying circuit, IJBT full-bridge modules and the full-bridge control electricity of connection
Road, photoelectric coupling circuit are also connected with IJBT full-bridge modules and full-bridge control circuit respectively.
In embodiments of the present invention, each device parameters are as shown in Figure 1.
In embodiments of the present invention, single chip control module includes microcontroller U1, clock circuit, I2C communication interfaces, low frequency
Load button and reset circuit, microcontroller U1 are connected with display by I2C communication interfaces, the model of microcontroller U1
ATMEGA328P, the model I2CLCD1602 of display；Clock circuit includes capacitance C1, capacitance C2 and crystal oscillator X1, capacitance C1
One end and one end of crystal oscillator X1 be all connected with the 7th pin of microcontroller U1, one end of capacitance C2 and the other end of crystal oscillator X1 connect
The 8th pin of microcontroller U1 is connect, the other end of capacitance C1 and the other end of capacitance C2 are all connected to ground；I2C communication interfaces include
SDA interfaces and SCL interfaces, SDA interfaces are connected with the 26th foot of microcontroller U1, and SCL interfaces are connected with the 27th foot of microcontroller；It is low
Frequency load button includes button K1, button K2 and button K3, and one end of button K1 is connected with the 23rd pin of microcontroller U1, button
One end of K2 is connected with the 24th pin of microcontroller U1, and one end of button K3 is connected with the 25th pin of microcontroller U1, button K1
The other end, the other end of button K2 and the other end of button K3 be all connected to ground；Reset circuit includes reset button K0 and answers
Position resistance R0, one end of reset button KO and one end of reset resistor R0 are all connected to the 29th pin of microcontroller U1, and reset is pressed
The other end of button K0 is connected to ground, and the other end of reset resistor R0 is electric with the 18th pin and microcontroller power supply of microcontroller U1 respectively
+ 5V the output voltages on road are connected.
In embodiments of the present invention, photoelectric coupling circuit includes optocoupler U2, optocoupler U3, optocoupler U4, optocoupler U5 and optocoupler U6,
Optocoupler U2, optocoupler U3, optocoupler U4, optocoupler U5 and optocoupler U6 model be PC817, the 2nd pin of optocoupler U2, the of optocoupler U3
2 pins, the 2nd pin of optocoupler U4, the 2nd pin of optocoupler U5, optocoupler U6 the 2nd pin be all connected to ground, optocoupler U2 the 1st pipe
Foot is connected by resistance R1 with the 10th pin of microcontroller U1, and the 3rd pin of optocoupler U2 is connected with full-bridge control circuit, optocoupler U2
The 4th pin be connected with the signal output end of power circuit, the 1st pin of optocoupler U3 passes through the 32nd of resistance R2 and microcontroller U1
Pin is connected, and the 3rd pin of optocoupler U3 is connected with half-bridge driven amplifying circuit, and the 4th pin of optocoupler U3 is distinguished by resistance R6
It is connected with half-bridge driven amplifying circuit, IJBT full-bridge modules and VCC, the 1st pin of optocoupler U4 passes through resistance R3 and microcontroller U1
The 1st pin be connected, the 4th pin of optocoupler U4 is connected with half-bridge driven amplifying circuit, and the 3rd pin of optocoupler U4 passes through resistance R7
It is connected with half-bridge driven amplifying circuit and is connected to ground, the 2nd pin that the 1st pin of optocoupler U5 passes through resistance R4 and microcontroller U1
Be connected, the 3rd pin of optocoupler U5 is connected with half-bridge driven amplifying circuit, the 4th pin of optocoupler U5 by resistance R8 respectively with partly
Bridge drive amplification circuit, IJBT full-bridge modules are connected with VCC, and the 1st pin of optocoupler U6 passes through the 9th of resistance R5 and microcontroller U1
Pin is connected, and the 3rd pin of optocoupler U6 is connected by resistance R9 and is connected to half-bridge driven amplifying circuit, and the of optocoupler U6
4 pins are connected with half-bridge driven amplifying circuit.
In embodiments of the present invention, half-bridge driven amplifying circuit includes half-bridge driven amplifier U7 and half-bridge driver U8,
The model of half-bridge driver U7 and half-bridge driver U8 are IR2106, the 1st pin of half-bridge driver U7 respectively with resistance R6,
VCC is connected with the anode of diode D1, and the 2nd pin of half-bridge driver U7 is connected with the 4th pin of optocoupler U4, half-bridge driver
The 3rd pin of U7 is connected with the 3rd pin of optocoupler U3, and the 4th pin connection resistance R7 of half-bridge driver U7 is simultaneously connected to ground, and half
The 5th pin of bridge driver U7 is connected by resistance R11 with IJBT full-bridge modules, the 6th pin of half-bridge driver U7 respectively with
IJBT full-bridge modules are connected with one end of capacitance C3, and the 7th pin of half-bridge driver U7 passes through resistance R10 and IJBT full-bridge modules
It is connected, the 8th pin of half-bridge driver U7 is connected with the cathode of the other end of capacitance C3 and diode D1 respectively, half-bridge driver
The 1st pin of U8 is connected with the anode of resistance R8, VCC and diode D2 respectively, the 2nd pin and the optocoupler U6 of half-bridge driver U8
The 4th pin be connected, the 3rd pin of half-bridge driver U8 is connected with the 3rd pin of optocoupler U5, half-bridge driver U8 the 4th manage
Foot connects resistance R9 and is connected to ground, and the 5th pin of half-bridge driver U8 is connected by resistance R13 with IJBT full-bridge modules, and half
The 6th pin of bridge driver U8 is connected with one end of capacitance C4 and IJBT full-bridge modules respectively, the 7th pin of half-bridge driver U8
Be connected with IJBT full-bridge modules by resistance R12, the 8th pin of half-bridge driver U8 respectively with the other end of capacitance C4 and two poles
The cathode of pipe D2 is connected, and the model of diode D1 and diode D2 are IN4007.
In embodiments of the present invention, IJBT full-bridge modules include field-effect transistor Q1, field-effect transistor Q2, field-effect
Transistor Q3, field-effect transistor Q4, capacitance C7 and induction coil L1, field-effect transistor Q1, field-effect transistor Q2, field effect
It is STGY40NC60VD, the grid and capacitance of field-effect transistor Q1 to answer the model of transistor Q3 and field-effect transistor Q4
R10 is connected, the source electrode of field-effect transistor Q1 respectively with the 6th pin of half-bridge driver U7, one end of capacitance C7 and field-effect
The drain electrode of transistor Q2 is connected, and the drain electrode of field-effect transistor Q1 is electric with the drain electrode of field-effect transistor Q3 and full-bridge control respectively
Road is connected, and the grid of field-effect transistor Q2 is connected by R11 with the 5th pin of half-bridge driver U7, field-effect transistor Q2
Source electrode be connected respectively with the source electrode of field-effect transistor Q4 and full-bridge control circuit, the grid of field-effect transistor Q3 passes through
Resistance R12 is connected with the 7th pin of half-bridge driver U8, the source electrode of field-effect transistor Q3 respectively with induction coil L1 one
It holds, the 6th pin of half-bridge driver U8 is connected with the drain electrode of field-effect transistor Q4, the other end and the capacitance C7 of induction coil L1
The other end be connected, the grid of field-effect transistor Q4 is connected by resistance R13 with the 5th pin of half-bridge driver U8.
In embodiments of the present invention, full-bridge control circuit include diode D3, relay RL1, full bridge rectifier BR1,
The model RLY-SPNO of the model IN4007 of fuse FU1 and knife-like switch SW1, diode D3, relay RL1, knife-like switch
Coil one end of the model SW-DPST of SW1, relay RL1 the 3rd pin with the cathode of diode D3 and optocoupler U2 respectively
It is connected, the coil other end of relay RL1 is connected with the anode of diode D3 and is connected to ground, contact one end of relay RL1
Be connected with 1 end of full bridge rectifier BR1, the contact other end of relay RL1 by fuse FU1 and knife-like switch SW1 with
220V power supplys are connected, 2 ends of full bridge rectifier BR1 respectively with the drain electrode of field-effect transistor Q1 and field-effect transistor Q3
Drain electrode is connected, and 3 ends of full bridge rectifier BR1 are connected by knife-like switch SW1 with 220V power supplys, 4 ends of full bridge rectifier BR1
It is connected respectively with the source electrode of the source electrode of field-effect transistor Q2 and field-effect transistor Q4.
In embodiments of the present invention, 2 ends of full bridge rectifier BR1 are also connected with one end of capacitance C8 and VCC respectively, entirely
The other end of 4 ends of bridge rectification circuit BR1 also with capacitance C8 is commonly connected to ground.
In embodiments of the present invention, microcontroller power supply circuit includes voltage-stablizer U9, capacitance C5, capacitance C6, capacitance C7, capacitance
C8, full bridge rectifier BR2 and transformer T1, the model 78L05 of the voltage-stablizer U9, the primary coil of transformer T1 with
220V input voltages are connected, and the secondary coil of transformer T1 is connected with 1 end of full bridge rectifier BR2 and 3 ends respectively, and full-bridge is whole
2 ends of current circuit BR2 are connected with 3 ends of one end of capacitance C8, one end of capacitance C7 and voltage-stablizer U9 respectively, full bridge rectifier
4 ends of BR2 and the other end of capacitance C8, the other end of capacitance C7,2 ends of voltage-stablizer U9, one end of capacitance C6 and capacitance C5
One end is all connected to ground, and the other end of capacitance C6 and the other end of capacitance C5 are connected to the 1 end generation+5V output electricity of voltage-stablizer U9
Pressure.
The present invention specific work process be：Microcontroller U1, control single chip computer are given by low frequency load button input signal
The switch of the frequency of U1 and empty accounting and IJBT full-bridge modules power supplys exports four groups of pwm pulses by microcontroller U1, passes through light
Coupling U3, optocoupler U4, optocoupler U5 and optocoupler U6 isolation realize control to two half-bridge drivers and to one group of field-effect transistor
Bipolar complementary metal oxide semiconductor full-bridge realizes driving, makes the load of DC voltage conversion direction on LC resonance circuit,
Make to generate AC signal inside induction coil, sensing heating realized to workpiece, by display real-time display sensing heating frequency and
The startup situation of empty accounting and IJBT full-bridge modules.220V alternating currents are become 5V alternating currents by transformer T1, by complete
Wave bridge rectifier BR2 becomes 5V direct currents, is provided surely to microcontroller by filter capacitor C5-C8 and integrated regulator U9
Determine the DC power supply of 5V.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of variable frequency induction heater circuit, which is characterized in that including heater circuit, display and microcontroller power supply circuit, institute
It states microcontroller power supply circuit to be respectively connected with display and heater circuit, the heater circuit is connected with display, the heating
Circuit include sequentially connected single chip control module, photoelectric coupling circuit, half-bridge driven amplifying circuit, IJBT full-bridge modules and
Full-bridge control circuit, the photoelectric coupling circuit are also connected with IJBT full-bridge modules and full-bridge control circuit respectively.
2. variable frequency induction heater circuit according to claim 1, which is characterized in that the single chip control module includes single
Piece machine U1, clock circuit, I2C communication interfaces, low frequency load button and reset circuit, the microcontroller U1 pass through with display
I2C communication interfaces are connected, the model ATMEGA328P of the microcontroller U1；The clock circuit includes capacitance C1, capacitance C2
With crystal oscillator X1, one end of the capacitance C1 and one end of crystal oscillator X1 are all connected with the 7th pin of microcontroller U1, and the one of the capacitance C2
The other end of end and crystal oscillator X1 are all connected with the 8th pin of microcontroller U1, the other end of the other end and capacitance C2 of the capacitance C1
It is all connected to ground；The I2C communication interfaces include SDA interfaces and SCL interfaces, the 26th foot of the SDA interfaces and microcontroller U1
It is connected, the SCL interfaces are connected with the 27th foot of microcontroller；The low frequency load button includes button K1, button K2 and button
K3, one end of the button K1 are connected with the 23rd pin of microcontroller U1, one end of the button K2 and the 24th of microcontroller U1 the
Pin is connected, one end of the button K3 is connected with the 25th pin of microcontroller U1, the other end of the button K1, button K2
The other end of the other end and button K3 are all connected to ground；The reset circuit includes reset button K0 and reset resistor R0, described
One end of reset button KO and one end of reset resistor R0 are all connected to the 29th pin of microcontroller U1, the reset button K0's
The other end is connected to ground, the other end of the reset resistor R0 respectively with the 18th pin and microcontroller power supply circuit of microcontroller U1
+ 5V output voltages be connected.
3. variable frequency induction heater circuit according to claim 2, which is characterized in that the photoelectric coupling circuit includes optocoupler
The model of U2, optocoupler U3, optocoupler U4, optocoupler U5 and optocoupler U6, the optocoupler U2, optocoupler U3, optocoupler U4, optocoupler U5 and optocoupler U6
It is PC817, the 2nd pin of the optocoupler U2, the 2nd pipe of the 2nd pin of optocoupler U3, the 2nd pin of optocoupler U4, optocoupler U5
Foot, optocoupler U6 the 2nd pin be all connected to ground, the 1st pin of the optocoupler U2 passes through the 10th pipe of resistance R1 and microcontroller U1
Foot is connected, and the 3rd pin of the optocoupler U2 is connected with full-bridge control circuit, the 4th pin of the optocoupler U2 and power circuit
Signal output end is connected, and the 1st pin of the optocoupler U3 is connected by resistance R2 with the 32nd pin of microcontroller U1, the optocoupler
The 3rd pin of U3 is connected with half-bridge driven amplifying circuit, the 4th pin of the optocoupler U3 by resistance R6 respectively with half-bridge driven
Amplifying circuit, IJBT full-bridge modules are connected with VCC, and the 1st pin of the optocoupler U4 passes through the 1st of resistance R3 and microcontroller U1 and manages
Foot is connected, and the 4th pin of the optocoupler U4 is connected with half-bridge driven amplifying circuit, and the 3rd pin of the optocoupler U4 passes through resistance
R7 is connected with half-bridge driven amplifying circuit and is connected to ground, and the 1st pin of the optocoupler U5 passes through resistance R4's and microcontroller U1
2nd pin is connected, and the 3rd pin of the optocoupler U5 is connected with half-bridge driven amplifying circuit, and the 4th pin of the optocoupler U5 passes through
Resistance R8 is connected with half-bridge driven amplifying circuit, IJBT full-bridge modules and VCC respectively, and the 1st pin of the optocoupler U6 passes through electricity
Resistance R5 is connected with the 9th pin of microcontroller U1, and the 3rd pin of the optocoupler U6 passes through resistance R9 and half-bridge driven amplifying circuit phase
Connect and be connected to ground, the 4th pin of the optocoupler U6 is connected with half-bridge driven amplifying circuit.
4. variable frequency induction heater circuit according to claim 3, which is characterized in that the half-bridge driven amplifying circuit includes
The model of half-bridge driver U7 and half-bridge driver U8, the half-bridge driver U7 and half-bridge driver U8 are IR2106, institute
The 1st pin for stating half-bridge driver U7 is connected with the anode of resistance R6, VCC and diode D1 respectively, the half-bridge driver U7
The 2nd pin be connected with the 4th pin of optocoupler U4, the 3rd pin phase of the 3rd pin and optocoupler U3 of the half-bridge driver U7
Even, the 4th pin of the half-bridge driver U7 connects resistance R7 and is connected to ground, and the 5th pin of the half-bridge driver U7 is logical
Resistance R11 is crossed with IJBT full-bridge modules to be connected, the 6th pin of the half-bridge driver U7 respectively with IJBT full-bridge modules and capacitance
One end of C3 is connected, and the 7th pin of the half-bridge driver U7 is connected by resistance R10 with IJBT full-bridge modules, the half-bridge
The 8th pin of driver U7 is connected with the cathode of the other end of capacitance C3 and diode D1 respectively, the half-bridge driver U8's
1st pin is connected with the anode of resistance R8, VCC and diode D2 respectively, the 2nd pin and the optocoupler U6 of the half-bridge driver U8
The 4th pin be connected, the 3rd pin of the half-bridge driver U8 is connected with the 3rd pin of optocoupler U5, the half-bridge driver U8
The 4th pin connection resistance R9 and be connected to ground, the 5th pin of the half-bridge driver U8 passes through resistance R13 and IJBT full-bridges
Module is connected, and the 6th pin of the half-bridge driver U8 is connected with one end of capacitance C4 and IJBT full-bridge modules respectively, and described half
The 7th pin of bridge driver U8 is connected by resistance R12 with IJBT full-bridge modules, the 8th pin point of the half-bridge driver U8
It is not connected with the cathode of the other end of capacitance C4 and diode D2.
5. variable frequency induction heater circuit according to claim 4, which is characterized in that the IJBT full-bridge modules include field effect
Answer transistor Q1, field-effect transistor Q2, field-effect transistor Q3, field-effect transistor Q4, capacitance C7 and induction coil L1, institute
The grid for stating field-effect transistor Q1 is connected with capacitance R10, the source electrode of the field-effect transistor Q1 respectively with half-bridge driver
The 6th pin of U7, one end of capacitance C7 are connected with the drain electrode of field-effect transistor Q2, the drain electrode point of the field-effect transistor Q1
Be not connected with the drain electrode of field-effect transistor Q3 and full-bridge control circuit, the grid of the field-effect transistor Q2 by R11 with
The 5th pin of half-bridge driver U7 is connected, the source electrode of the field-effect transistor Q2 source with field-effect transistor Q4 respectively
Pole is connected with full-bridge control circuit, and the grid of the field-effect transistor Q3 passes through the 7th of resistance R12 and half-bridge driver U8 and manages
Foot is connected, the source electrode of the field-effect transistor Q3 respectively with one end of induction coil L1, half-bridge driver U8 the 6th pin and
The drain electrode of field-effect transistor Q4 is connected, and the other end of the induction coil L1 is connected with the other end of capacitance C7, the field effect
The grid of transistor Q4 is answered to be connected with the 5th pin of half-bridge driver U8 by resistance R13.
6. variable frequency induction heater circuit according to claim 5, which is characterized in that the full-bridge control circuit includes two poles
Coil one end point of pipe D3, relay RL1, full bridge rectifier BR1, fuse FU1 and knife-like switch SW1, the relay RL1
It is not connected with the 3rd pin of the cathode of diode D3 and optocoupler U2, the coil other end of the relay RL1 is with diode D3's
Anode is connected and is connected to ground, and contact one end of the relay RL1 is connected with 1 end of full bridge rectifier BR1, the relay
The contact other end of device RL1 is connected by fuse FU1 and knife-like switch SW1 with 220V power supplys, the full bridge rectifier BR1's
2 ends are connected with the drain electrode of field-effect transistor Q1 and the drain electrode of field-effect transistor Q3 respectively, the full bridge rectifier BR1's
3 ends are connected by knife-like switch SW1 with 220V power supplys, and 4 ends of the full bridge rectifier BR1 are respectively with field-effect transistor Q2's
Source electrode is connected with the source electrode of field-effect transistor Q4.
7. variable frequency induction heater circuit according to claim 6, which is characterized in that 2 ends of the full bridge rectifier BR1
Also it is connected respectively with one end of capacitance C8 and VCC, 4 ends of the full bridge rectifier BR1 are also common with the other end of capacitance C8
It is connected to ground.
8. variable frequency induction heater circuit according to claim 1, which is characterized in that the microcontroller power supply circuit includes steady
Depressor U9, capacitance C5, capacitance C6, capacitance C7, capacitance C8, full bridge rectifier BR2 and transformer T1, the type of the voltage-stablizer U9
Number it is 78L05, the primary coil of the transformer T1 is connected with 220V input voltages, and the secondary coil of the transformer T1 is distinguished
Be connected with 1 end of full bridge rectifier BR2 and 3 ends, 2 ends of the full bridge rectifier BR2 respectively with one end of capacitance C8, electricity
The one end for holding C7 is connected with 3 ends of voltage-stablizer U9,4 ends of the full bridge rectifier BR2 and the other end of capacitance C8, capacitance C7
The other end, 2 ends of voltage-stablizer U9, one end of capacitance C6 and capacitance C5 one end be all connected to ground, the capacitance C6's is another
The other end of end and capacitance C5 are connected to the 1 end generation+5V output voltages of voltage-stablizer U9.
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| CN201711118654.4A CN108601123B (en) | 2017-11-13 | 2017-11-13 | Variable-frequency induction heating circuit |
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| CN201711118654.4A CN108601123B (en) | 2017-11-13 | 2017-11-13 | Variable-frequency induction heating circuit |
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| CN111182661A (en) * | 2020-02-26 | 2020-05-19 | 佛山市斯特美光电科技有限公司 | Heating circuit |
| CN113340488A (en) * | 2021-07-20 | 2021-09-03 | 成都航空职业技术学院 | Force-controlled joint torque measuring circuit |
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| CN108601123B (en) | 2021-03-23 |
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